On Tue, 2013-02-12 at 16:29 -0500, Brandon Ross wrote:
It seems that, then, MLD snooping is valuable as it will prevent DAD and other ND traffic from using bandwidth towards hosts not in that group.
It will prevent *all* multicast traffic from using bandwidth towards hosts not in the multicast groups involved. ND, DAD etc are just specific cases.
Other than solicited node multicast, is MLD used anywhere else in a network that does not have layer 3 multicast enabled on a router?
MLD is used for all multicast - so a DHCPv6 packet, for example, will only go to any relays and servers in the subnet. *Any* multicast will be limited to its listeners. The only multicast that will go to all nodes will be multicast sent to the "all link-local nodes" address - and even that will not go to non-IPv6 nodes. MLD snooping happens on switches - you will get the benefit even if in an isolated network (no router at all). Regards, K. -- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Karl Auer (kauer@biplane.com.au) http://www.biplane.com.au/kauer http://www.biplane.com.au/blog GPG fingerprint: B862 FB15 FE96 4961 BC62 1A40 6239 1208 9865 5F9A Old fingerprint: AE1D 4868 6420 AD9A A698 5251 1699 7B78 4EEE 6017